Search Dockable engines?

[the.punk]

Hi,
I'm looking for a dockable engine. I mean something like a second stage or booster, but with a dockingport.

Are there any add-ons like this?

 

[T.Neo]

My Orbital concept, click the link in my sig.
It won't be around for a while though.
You could put a docking port on a velcro stage, I've done this before, I'm not sure if there are any negative side effects though.

 

[the.punk]

Yes your orbital tug is very cool, but it is still under develop. (And I'm not quite a good add-on maker)
I search something to eject a little space station from earth orbit.

 

[T.Neo]

your orbital tug is very cool

Thank you.
The reason it is on hold is because my VC++ compiler isnt working.

I search something to eject a little space station from earth orbit.

Aha.
What is the mass of the station?
What is the shape of the station?
Where do you want to send this station? To what Dv?

If you want, I can make a simple mesh and config for you.

 

[Notebook]

Would the Orbiter Dragonfly do the job?

RCS mounted in 3 pods (left, right, aft) total 16 thrusters​

Thrust rating 1.0 kN per thruster

N.

 

[T.Neo]

I doubt it. You'll probably be around the Earth more then once before braking out of Orbit. I think the RCS are more for minor manouvers, like the Shuttle RCS.

 

[the.punk]

Where do you want to send this station? To what Dv?
If you want, I can make a simple mesh and config for you.

That would be very nice:speakcool:. I don't have any destination for it but the engine that I mean must have an acceleration of 20m/s.

 

[T.Neo]

What is the mass of the station?

 

[the.punk]

The mass is 65 tons.

 

[T.Neo]

I get 5.23 m/s squared from the thing.
If this is m/s squared, must I change it to get m/s?

 

[the.punk]

m/s squared is the acceleration and m/s is only the velocety.

 

[Matt Decker]

What about the Abora_Selene.

[ame="http://www.orbithangar.com/searchid.php?ID=242"]Abora-C tanker[/ame]

It also has a big fuel tank.

 

[T.Neo]

I'm suspecting 20m/s is the maximum limit, not the minimum, for this thing.
I get about 25m/s at the very end of the fuel. Is that acceptable?

 

[Zatnikitelman]

If you really want to shove this thing around at 20 m/s/s acceleration, then you need at least a 1.3 Meganewton (1,300,000 newton) rocket engine. easily accomplishable with today's technologies. SSME is 1.8 MN. The big question, is how fast do you want to accelerate the station by? A typical LEO-escape burn requires around 3.22 km/s so assuming that's what you want to do, you need 74,489.957 Kilograms of fuel for a burn lasting 241.625 seconds.

 

[T.Neo]

If you really want to shove this thing around at 20 m/s/s acceleration, then you need at least a 1.3 Meganewton (1,300,000 newton) rocket engine. easily accomplishable with today's technologies. SSME is 1.8 MN. The big question, is how fast do you want to accelerate the station by? A typical LEO-escape burn requires around 3.22 km/s so assuming that's what you want to do, you need 74,489.957 Kilograms of fuel for a burn lasting 241.625 seconds.

:huh:

Did you figure this out via the rocket equation? Did you factor in the empty mass of the stage? I'm using 3500 tons for the empty mass of the stage.

 

[sputnik]

Velcro Rockets should certainly be able to do what you want.

In fact, if you just take the Energia-M core, or S-IVb from Velcro Saturns, and give it a docking module at the nose, I think it would do exactly what you're asking for with no further modifications.

 

[the.punk]

No, I don't mean that the station must have an acceleration of 20m/s/s.
I mean that only the booster engine should have an acceleration of 20m/s/s.